@article {1132446,
	title = {Metasurface-assisted phase-matching-free second harmonic generation in lithium niobate waveguides},
	journal = {Nature Communications},
	volume = {8},
	year = {2017},
	pages = {2098},
	url = {https://www.nature.com/articles/s41467-017-02189-6},
	author = {Wang, Cheng and Zhaoyi Li and Myoung-Hwan Kim and Xiao Xiong and Xi-Feng Ren and Guang-Can Guo and Nanfang Yu and Loncar, Marko}
}
